Quantum computation and simulation with superconducting qubits

K He, X Geng, R Huang, J Liu, W Chen - Chinese Physics B, 2021‏ - iopscience.iop.org
Superconducting circuits based on Josephson junctions are regarded as one of the most
promising technologies for the implementation of scalable quantum computers. This review …

Signatures of dissipation driven quantum phase transition in Rabi model

G De Filippis, A De Candia, G Di Bello, CA Perroni… - Physical Review Letters, 2023‏ - APS
By using the worldline Monte Carlo technique, matrix product state, and a variational
approach à la Feynman, we investigate the equilibrium properties and relaxation features of …

Superradiant Quantum Phase Transition for an Exactly Solvable Two-Qubit Spin-Boson Model

R Grimaudo, D Valenti, A Sergi, A Messina - Entropy, 2023‏ - mdpi.com
A spin-boson-like model with two interacting qubits is analysed. The model turns out to be
exactly solvable since it is characterized by the exchange symmetry between the two spins …

Environment induced dynamical quantum phase transitions in two-qubit Rabi model

G Di Bello, A Ponticelli, F Pavan, V Cataudella… - Communications …, 2024‏ - nature.com
Quantum states beyond thermodynamic equilibrium represent fascinating and cutting-edge
research. However, the behavior of dynamical quantum phase transitions in complex open …

[HTML][HTML] Characterization of Quantum and Classical Critical Points for an Integrable Two-Qubit Spin–Boson Model

R Grimaudo, A Messina, H Nakazato, A Sergi… - Symmetry, 2023‏ - mdpi.com
The class of two-interacting-qubit spin–boson models with vanishing transverse fields on the
spin-pair is studied. The model can be mapped exactly into two independent standard single …

Quantum phase transition of many interacting spins coupled to a bosonic bath: Static and dynamical properties

G De Filippis, A De Candia, AS Mishchenko… - Physical Review B, 2021‏ - APS
By using worldline and diagrammatic quantum Monte Carlo techniques, matrix product state,
and a variational approach à la Feynman, we investigate the equilibrium properties and …

Anisotropic signatures in the spin-boson model

F Hartmann, S Scali, J Anders - Physical Review B, 2023‏ - APS
Thermal equilibrium properties of nanoscale systems deviate from standard macroscopic
predictions due to non-negligible coupling to the environment. For anisotropic three …

Critical Exponents and Universality for Fractal Time Processes above the Upper Critical Dimensionality

S Zeng, Y Hu, S Tan, B Wang - Fractal and Fractional, 2024‏ - mdpi.com
We study the critical behaviors of systems undergoing fractal time processes above the
upper critical dimension. We derive a set of novel critical exponents, irrespective of the order …

Theory of critical phenomena with long-range temporal interaction

S Zeng, F Zhong - Physica Scripta, 2023‏ - iopscience.iop.org
We systematically develop theories of critical phenomena with a prior formed memory of a
power-law decaying long-range temporal interaction parameterized by a constant θ> 0 for a …

Quantum criticality of the Ohmic spin-boson model in a high dense spectrum: Symmetries, quantum fluctuations and correlations

X Qian, C Zeng, N Zhou - Physica A: Statistical Mechanics and its …, 2021‏ - Elsevier
Study of dissipative quantum phase transitions in the Ohmic spin-boson model is
numerically challenging in a dense limit of environmental modes. In this work, large-scale …